Remove Cruft from Develop and Merge with Master

[jsilve24]

• Ensure passing tests
• Remove truncated laplace
• Keep MultDirBoot
• Remove RSpectra as Dependency
• Remove RcppZiggurat as Dependency (remove MatDist.h standalone)
• Remove any code that begins with foo*

[jsilve24]

Develop commit: de3f75f1b77ed1754cb21ec6dd8d23fc9d023869

• removed truncated laplace
• remove Rspectra as dependency